All life includes loss. It's taken me many, many years to learn to deal with that, and I don't expect I'll ever be fully resigned to it. But that doesn't mean we have to turn away from the world, or stop striving for the best that we can do and be. We owe that much to ourselves, at least, and we deserve whatever measure of good may come of it.
The value of the things is not in themselves autonomously, but that God made them, and thus they deserve to be treated with high respect. The tree in the field is to be treated with respect. It is not to be romanticized as the old lady romanticizes her cat (that is, she reads human reactions into it). This is wrong because it is not true. When you drive the axe into the tree when you need firewood, you are not cutting down a person; you are cutting down a tree. But while we should not romanticize the tree, we must realize God made it and it deserves respect because He made is as a tree.